Image processing device

Abstract

Provided is an image processing device configured to compress first image data. The image processing device includes an encoding circuit configured to compress the first image data into second image data including prediction data and residual data, compress the second image data into third image data by performing entropy encoding on the second image data, generate a header representing a compression ratio of the third image data, and store the third image data along with the header in a memory device as compressed first image data.

What is claimed is: 
     
       1. An image processing device comprising:
 a multimedia intellectual property (IP) configured to receive and process first image data and generate and use second image data; 
 a frame buffer compressor configured to compress the second image data into third image data and decompress the third image data into the second image data; 
 a memory configured to store the third image data and accessed by the multimedia IP, 
 wherein the frame buffer compressor performs compression or decompression when the multimedia IP accesses the memory, the frame buffer compressor operates in a lossy compression mode or a lossless compression mode, the lossless compressed third image data includes a first payload and a first header, the first header includes an index, and the lossy compressed third image data includes second payload only, and the second payload is compressed by a preset compression ratio, 
 where the index is a single value that maps to one of a plurality of different compression ratio ranges of the first payload. 
 
     
     
       2. The image processing device of  claim 1 , wherein a size of the first payload is an integer multiple of a size of a data access unit of the memory. 
     
     
       3. The image processing device of  claim 1 , wherein the first payload includes a first binary code and a first k value code, the first binary code is the second image data entropy encoded and the first k value code represents a k value of the entropy encoded first binary code, and wherein the second payload includes a second binary code and a second k value code, the second binary code is the second image data entropy encoded. 
     
     
       4. The image processing device of  claim 3 , wherein the second binary code is quantized by a predetermined quantization parameter (QP), the second payload includes a QP code, and the QP code indicates the QP of the second binary code. 
     
     
       5. The image processing device of  claim 1 , wherein the second image data is encoded into YUV and includes a luma signal block, a first chroma signal block and a second chroma signal block. 
     
     
       6. The image processing device of  claim 5 , wherein the frame buffer compressor operates first to third modes, in the first mode, the frame buffer compressor compresses the luma signal block, the first chroma signal block and the second chroma signal block of the second image data together, in the second mode, the frame buffer compressor compresses the first chroma signal block and the second chroma signal block of the second image data together and separately compresses the luma signal block of the second image data, and in the third mode, the frame buffer compressor compresses the luma signal block, the first chroma signal block and the second chroma signal block of the second image data respectively. 
     
     
       7. The image processing device of  claim 6 , wherein the third image data includes a binary code which is the compressed second image data, in the first mode and the second mode, the binary code includes data about each pixel, and the data about each pixel includes the data of a different plane. 
     
     
       8. The image processing device of  claim 6 , wherein the third image data includes a binary code and a k-value code, the binary code is the second image data entropy encoded and the k-value code indicates a k-value of the entropy encoded binary code, the k-value code has a first size when the third image data is compressed in the third mode, the k-value code is one or twice a size of the first size when the third image data is compressed in the second mode, and the k-value code is one, twice or three-times a size of the first size when the third image data is compressed in the first mode. 
     
     
       9. The image processing device of  claim 6 , wherein a binary code is quantized by a predetermined quantization parameter (QP), the third image data includes a QP code, the QP code indicates a QP of the binary code, the QP code has a second size when the third image data is compressed in the third mode, the QP code is one or twice a size of the second size when the third image data is compressed in the second mode, the QP code is one, twice or three-times a size of the second size when the third image data is compressed in the first mode. 
     
     
       10. The image processing device of  claim 5 , wherein a size ratio of the luma signal block, the first chroma signal block and the second chroma signal block in the second image data is 4:1:1 or 4:2:2. 
     
     
       11. An image processing device comprising:
 a multimedia intellectual property (IP) configured to receive and process first image data and generate and use second image data; 
 a frame buffer compressor configured to compress the second image data into third image data and decompress the third image data into the second image data; and 
 a memory configured to store the third image data to be accessed by the multimedia IP, and 
 wherein the frame buffer compressor includes,
 an encoder configured to compress the second image data into the third image data; and 
 a decoder configured to decompress the third image data into the second image data, wherein the encoder includes a prediction module to divide and represent prediction data and residual data and an entropy encoding module to perform entropy encoding on the second image data and compress the encoded second image data according to a k-value code, the decoder includes a prediction compensation module to decode the prediction data and the residual data into the second image data and an entropy decoding module to decode the third image data according to the k-value code located within a payload of the third image data, 
 the k-value code includes at least one k value for color signal blocks of the second image data, and 
 the third image data is generated based on an entropy table corresponding to the k-value code. 
 
 
     
     
       12. The image processing device of  claim 11 , wherein the encoder includes a quantization module to quantize the second image data based on a quantization parameter (QP) and compress the quantized second image data, the decoder includes an inverse quantization module to decode the second image data based on the QP. 
     
     
       13. The image processing device of  claim 12 , wherein the frame buffer operates in a lossy mode or a lossless mode, in the lossless mode, the second image data is transformed a compression data by the prediction module and the entropy encoding module, in the lossy mode, the second image data is compressed to the third image data by the prediction module, the quantization module and the entropy encoding module. 
     
     
       14. The image processing device of  claim 12 , further comprising:
 a padding module configured to generate the third image data for padding corresponding to a size of the compressed data and a header indicating a compression ratio of the third image data. 
 
     
     
       15. The image processing device of  claim 14 , wherein the padding module is configured such that a size of the compression data is a first integer multiple of a size of a data access unit of the memory by the padding, and the compression ratio corresponds to the first integer. 
     
     
       16. An image processing device comprising:
 a multimedia intellectual property (IP) configured to receive and process first image data and generate and use second image data; 
 a frame buffer compressor configured to compress the second image data into third image data and decompress the third image data into the second image data; and 
 a memory configured to store the third image data to be accessed by the multimedia IP, and 
 wherein the frame buffer compressor is configured to perform the compressing or the decompressing whenever the multimedia IP accesses the memory, the second image data includes a luma signal block, a first chroma signal block and a second chroma signal block, which is encoded into YUV, wherein the frame buffer compressor operates first to third modes, in the first mode, the frame buffer compressor compresses the luma signal block, the first chroma signal block and the second chroma signal block of the second image data together, in the second mode, the frame buffer compressor compresses the first chroma signal block and the second chroma signal block of the second image data together and separately compresses the luma signal block of the second image data, and in the third mode, the frame buffer compressor compresses the luma signal block, the first chroma signal block and the second chroma signal block of the second image data respectively. 
 
     
     
       17. The image processing device of  claim 16 , wherein the multimedia IP includes an image signal processor to transform the first image data into the second image data and transfer the second image data to the frame buffer compressor, the first image data is RGB format data and the second image data is YUV format data. 
     
     
       18. The image processing device of  claim 17 , wherein the multimedia IP includes a multi-format codec to receive the second image data from the frame buffer compressor and compress the second image data and return the compressed second image data to the frame buffer compressor. 
     
     
       19. The image processing device of  claim 18 , further comprising:
 a shake correction module configured to receive the second image data from the frame buffer compressor, perform a shake correction on the second image data and return the corrected second image data to the frame buffer compressor. 
 
     
     
       20. The image processing device of  claim 17 , further comprising:
 a graphic processing unit (GPU) configured to receive the second image data from the frame buffer compressor, perform a graphic processing for the second image data and return the processed data to the frame buffer compressor.